Add README

README.md

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+# MonoSlicer
+
+A monophonic sample slicer and sampler instrument built with [JUCE](https://juce.com/) and CMake.
+
+Load an audio file, slice it into regions (automatically via onset detection or manually), and trigger individual slices via MIDI.
+
+## Features
+
+- **Slice & trigger** -- Load WAV, AIFF, FLAC, or OGG files and play slices chromatically via MIDI (starting at C3)
+- **Auto-slice** -- Onset-based detection with adjustable sensitivity
+- **Manual slice control** -- Click to add, right-click to remove, drag to reposition slice markers
+- **Per-voice envelopes** -- Amplitude and filter ADSR envelopes with configurable depth
+- **Filter** -- 5-mode biquad filter (LP12, LP24, HP, Bandpass, Notch) with cutoff, resonance, and envelope depth
+- **Tone shaping** -- Bass and treble controls
+- **Pitch shift** -- Key transpose from -12 to +12 semitones
+- **Time stretch** -- Resample to a target beat count at a given BPM
+- **Undo/redo** for slice operations
+- **Zoomable waveform display** with piano key sidebar and time ruler
+- **Full DAW state recall** -- All parameters and slices are saved with your session
+- **UI scaling** from 50% to 200%
+
+## Building
+
+Requires CMake 3.22+ and a C++17 compiler.
+
+```sh
+make fetch      # Clone JUCE 8.0.9
+make configure  # CMake configure
+make build      # Build (Release)
+```
+
+### Installing
+
+```sh
+make install
+```
+
+Copies AU and VST3 to the system plugin directories and triggers an Audio Unit rescan.
+
+### Clean
+
+```sh
+make clean
+```
+
+## Plugin Formats
+
+- Audio Unit (AU)
+- VST3
+- Standalone
+
+## Usage
+
+1. Load an audio file via the **Load** button, drag-and-drop, or the **<** / **>** buttons to browse the current folder
+2. Click **Auto Slice** or manually click on the waveform to place slice markers
+3. Play slices via MIDI -- note C3 triggers slice 0, C#3 triggers slice 1, and so on
+4. Shape the sound with the amp/filter envelopes, filter, and tone controls
+
+### Waveform Interaction
+
+| Action | Effect |
+|---|---|
+| Left-click on waveform | Add slice marker |
+| Drag slice marker | Reposition |
+| Right-click on waveform | Remove nearest slice |
+| Click piano key | Trigger corresponding slice |
+| Mouse wheel | Zoom / scroll |